TUBE HEATERS TUBULAR SHEATHED HEATERS. These Heaters can be supplied straight or formed to customer requirements. Various Lengths, Diameters and wattages can be supplied to request. The sheath material is Bundy or Incoloy, giving long life. Teminals to customers request. Delivery: Non Stock Items normally 7-10 days CARTRIDGE HEATERS Various Diameters & Lengths of Cartridge Heaters are stocked (Imperial & Metric) 1/4" to 3/4"Dia, with High & Low watt density. Swaged & Crimped in leads, also Right Angle (Elbow Types). (Larger Diameters made to Order)